Casper, as the friendly ghost, tries to make friends and get a second chance at life instead of scaring everyone away, based on the Casper film.
The game's plot revolves around Carrigan Crittenden, the "spoiled, grasping inheritor of Whipstaff Manor", who is after the treasure she believes is hidden in the walls. Casper needs the help of Dr. James Harvey, a therapist to the dead, if he hopes to succeed in his adventures.
Casper will have to deal with his uncles - Stretch, Stinkie, and Fatso, who love scaring "Fleshies" and thwarting Casper's efforts. The gameplay involves mostly puzzle solving, as Casper can take various forms and manipulate objects in 3D.